It's a vaporware discussion by laymen. I can't believe a doctor would advocate using CPR when things like AED defibrillators are already handy.

High quality CPR includes AED usage. 30 compressions to two ventilations. After 2 minutes of CPR, perform a rhythm check with AED and shock if advised. There are existing robots that do chest compressions for you (Zoll AutoPulse, LUCAS). They would work in space I bet.

Source: I'm an EMT